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Double-hardening process delivers toughness and durability, shielding from scratches to preserve the original beauty of each timepiece When pure titanium is used for the case, bezel, or band material for MR-G timepieces, a double-hardening process is applied to each part. Pure titanium is lighter than stainless steel and highly resistant to rust, delivering outstanding corrosion resistance. Due to its relative softness, however, Casio applies this special double-hardening treatment to prevent sc